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Expr-offsetof

Make-expr-offsetof

Basic constructor macro for expr-offsetof structures.

Syntax

(make-expr-offsetof [:type <type>] 
                    [:member <member>])

This is the usual way to construct expr-offsetof structures. It simply conses together a structure with the specified fields.

This macro generates a new expr-offsetof structure from scratch. See also change-expr-offsetof, which can "change" an existing structure, instead.

Definition

This is an ordinary make- macro introduced by fty::defprod.

Macro: make-expr-offsetof

(defmacro make-expr-offsetof (&rest args)
  (std::make-aggregate 'expr-offsetof
                       args '((:type) (:member))
                       'make-expr-offsetof
                       nil))

Function: expr-offsetof

(defun expr-offsetof (type member)
  (declare (xargs :guard (and (tynamep type)
                              (member-designorp member))))
  (declare (xargs :guard t))
  (let ((__function__ 'expr-offsetof))
    (declare (ignorable __function__))
    (b* ((type (mbe :logic (tyname-fix type)
                    :exec type))
         (member (mbe :logic (member-designor-fix member)
                      :exec member)))
      (cons :offsetof (list type member)))))